231387408 has 240 divisors, whose sum is σ = 819322560. Its totient is φ = 62125056.

The previous prime is 231387353. The next prime is 231387413. The reversal of 231387408 is 804783132.

231387408 is a `hidden beast` number, since 231 + 387 + 40 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 359535 + ... + 360177.

It is an arithmetic number, because the mean of its divisors is an integer number (3413844).

Almost surely, 2^231387408 is an apocalyptic number.

231387408 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231387408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409661280).

231387408 is an abundant number, since it is smaller than the sum of its proper divisors (587935152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231387408 is a wasteful number, since it uses less digits than its factorization.

231387408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 231387408 is about 15211.4236020170. The cubic root of 231387408 is about 613.9220617827.

The spelling of 231387408 in words is "two hundred thirty-one million, three hundred eighty-seven thousand, four hundred eight".